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        <p><strong>简单的 <code>GET</code>和 <code>URL</code>加解码</strong></p>
<a id="more"></a>

<p>打开网页只有这</p>
<img src="D:\Hexo\source\_posts\CTF\web_wp\PHP2\firstlook.png" style="zoom:50%;" />

<p>御剑扫描出 <code>index.php</code> 和 <code>indexs.php</code> 从网友那得知</p>
<blockquote>
<p>phps文件就是php的源代码文件，通常用于提供给用户（访问者）查看php代码，因为用户无法直接通过Web浏览器看到php文件的内容，所以需要用phps文件代替。其实，只要不用php等已经在服&gt; 务器中注册过的MIME类型为文件即可，但为了国际通用，所以才用了phps文件类型。 它的MIME类型为：text/html, application/x-httpd-php-source,  application/x-httpd-php3-source。</p>
<p>phps文件就是php的源代码文件，是给用户查看源代码的，无法接受变量传参，因为不能当做php进行解析，所以index.phps?id=是不行的，将s去掉即可</p>
</blockquote>
<p>访问并查看index.phps的源代码</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?php</span></span><br><span class="line"><span class="keyword">if</span>(<span class="string">&quot;admin&quot;</span>===$_GET[id]) &#123;</span><br><span class="line">  <span class="keyword">echo</span>(<span class="string">&quot;&lt;p&gt;not allowed!&lt;/p&gt;&quot;</span>);</span><br><span class="line">  <span class="keyword">exit</span>();</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">$_GET[id] = urldecode($_GET[id]);</span><br><span class="line"><span class="keyword">if</span>($_GET[id] == <span class="string">&quot;admin&quot;</span>)</span><br><span class="line">&#123;</span><br><span class="line">  <span class="keyword">echo</span> <span class="string">&quot;&lt;p&gt;Access granted!&lt;/p&gt;&quot;</span>;</span><br><span class="line">  <span class="keyword">echo</span> <span class="string">&quot;&lt;p&gt;Key: xxxxxxx &lt;/p&gt;&quot;</span>;</span><br><span class="line">&#125;</span><br><span class="line"><span class="meta">?&gt;</span></span><br><span class="line"></span><br><span class="line">Can you anthenticate to this website?</span><br></pre></td></tr></table></figure>

<p>从网友得知</p>
<blockquote>
<p>双重编码，源码中第二行，第七行，第八行是关键，一开始给你框死不能满足admin,只要是admin，立刻退出。而第七行是<code>urldecode()</code>函数，是<code>url</code>编码解码函数但是你输入1次编码，直接给你变admin,你还是过不去，所以肯定是二次，二次编码后，浏览器还得在给你解一次，而且二次编码也很有趣，根据源码的定义，admin这单词任何一个字母，两个字母，三个字母等等，只要双重编码都可以绕过，当然你全部编码也可以。</p>
</blockquote>
<p>在<code>burp</code>的<code>decoder</code>中进行编码</p>
<p><code>admin</code> -&gt; <code>%61%64%6d%69%6e</code> -&gt; <code>%25%36%31%25%36%34%25%36%64%25%36%39%25%36%65</code></p>
<img src="D:\Hexo\source\_posts\CTF\web_wp\PHP2\encoder.png" style="zoom:50%;" />

<p>由网址可见，浏览器确实进行了一次编码</p>

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